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#10
I've only read the Yahoo report.
In that case, maybe what my friend suggested is correct.
Perhaps it is something to do with the valence states of the Phosphorus atom (+1, +3, +5).
WikipediaFor example, phosphorus often has a valence of three, but can also have other valences.
http://en.wikipedia.org/wiki/Valence_(chemistry)#Common_valences